Safety lifting hook



W. P. SIMPSON.

SAFETY LIFTING HOOK. APPLICATION FILED NOV. 20, 1920.

1,409,068, Patented Mar. 7, 1922.

FIR-5- Ila/emu HZ 1. 6 0111 9 UNITED STATES PATENT OFFICE.

WILLIAM: PETER SIMPSON, OF HOBSONVILLE, AUCKLAND, NEW ZEALAND.

SAFETY LIFTING HOOK.

To all whom it may concern:

Be it known that, lViLL-nitr Sine son, citizen of New Zealand, residing at Hobsonville, Auckland, has invented certain new and useful Improvements in Safety Lifting Hooks, of which the following is a specification.

This invention relates to hooks used on cranes, derricks and the like for lifting cargo and other loads, and provides an improved form of safety hook forthe aforesaid purpose.

According to the invention the hook is formed with a flattened upper portion on either side of which the sides of a forked keeper pass, said forked keeper being pivoted to the flattened portion near the edge thereof located over or nearest the hook point.

The flattened portion of the hook contains an arcuate slot concentric with the pivot of the keeper, and at the lower end of said slot, in the side edge thereof furthest from the pivot, a slight recess is provided.

Both sides of the forked keeper contain a slightly elongated hole through both of which and the slot in the flattened portion of the hook, the link of a lifting chain or a rope is passed,

The point of the hook has a raised central portion thereon on which the grooved lower end of the keeper looks, so that side play of the latter is prevented.

The invention will be further described with reference to the accompanying drawing, in which Figure l is an elevation of the hook closed,

Figure 2 shows same open,

Figure 3 is an elevation of the hook with the keeper removed, and

Figure l is an edge view of the latter.

In the drawing 1 is the hook and 2 the flattened upper portion of same.

The sides of the forked keeper 3 pass one on each side of the flattened upper portion 2 and are pivoted thereto by a pin 4 which is located near the edge of said portion 2 over the hook point.

The flattened upper portion of the hook 1 contains an arcuate slot 5 concentric with the keeper pivot pin 4, while opposite and sli htly elongated holes 6 are formed in the sides of the forked keeper 3.

The portion 2 has a slight recess 9 merging into the lower end of the slot 5 and ar- Specification of Letters Patent. Patented 31.11, 7, 1922. Application filed November 20, 1920.

Serial No. 425,367.

ranged at the side edge of the slot which is furthest from the pivot pin l.

The hook point is formed with a raised central portion 7 thereon, the latter being located in the same vertical plane as the flattened portion 2 of the hook 1, while the lower end of the keeper 3 is grooved as at 8 to pass on said raised portion 7 and prevent side play of the keeper.

The link 10 of a lifting chain or a rope is passed through the holes 6 in the forked keeper and also through the slot 5 in the flattened portion 2.

Vhen there is no load on the hook l, the lower end of the keeper 3 can be raised off the hook point to allow the bight of a rope or a sling to be placed on the hook. The raising of the lower end of the keeper 3 levers the hook 1 upwards until the link 10 or rope engages in the recess 9 in the side of the slot 5, which retains the keeper raised and the hook open until such time as sufficient strain is put on the hook to cause thelattcr to move downwards on the link 10 or rope, the same movementforcing the grooved lower end of the keeper 3 to close on the hook point.

The keeper 3 is kept closed by the weight of the suspended load until such time as the weight of the latter is taken off the hook, whereupon the keeper 3 can be opened as before described.

hat I do claim and desire to secure by Letters Patent of the United States is 1. A lifting hook having an upper portion containing a slot the lower end of one side edge of which is recessed; a keeper adapted to close on the hook point, pivoted to the upper portion of said hook towards the edge of the latter over the hook point, and containing an elongated hole which registers with said slot, and a member passing through said hole and slot for holding the keeper in closed position.

2. A lifting hook having a flattened upper portion containing a slot, the lower end of one side edge of which is recessed; a forked keeper adapted to close on the hook point, pivoted to said flattened portion towards the edge thereof over the hook point, and containing elognated holes which register with said slot, and a member passing through said holes and slot for holding the keeper in closed position.

3. A lifting hook having a flattened upper portion containing an arcuate slot the lower end of one Sideedge of which is recessed; a forked keeper with a grooved lower end adapted to close on a central raised portion on the hook point, pivoted to saidflattened portion towards the edge of the latter over the hook point and containing elongated holes which register with said slot, and a member passing through said holes and slot for holding the keeper in closed position.

4. A liftlng hook having a flattened upper portion a pivot pin carried by said upper portion, said upper portion being provided with an arcuate slot concentric with said pivot pin, said upper portion also having a 5. The combination with ahook'having a flattened upper portion provided with a pivot hole and an arcuate slotlconcentric with said hole, of a fork-shaped keeper having tines engaging opposite faces of said upper portion and provided with a part engageable with the point of said hook, a pivot pin passing through said keeper and through said hole, the upper portion of said hook being provided with a recess which merges into the lower end of said slot, said keeper being provided with aligned slightly elongated apertures which register with said slot, and a supporting member passing through said slightly elongated holes and through said slot, and adapted when occupying the upper end of said slot to hold said keeper in closed position, and when occupying said recess to hold said keeper in open position, In testimony whereof I aflix' mysignature in presence of two witnesses.

WILLIAM PETER SIMPSON. 

